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If you try this and the converter doesn’t lock up, then you will need to convert the transmission to one of the above-mentioned kits. With the engine running and 12 volts to the transmission, if the trans has already been converted, when the trans shifts into fourth gear this will also engage the torque converter clutch (TCC) to lock up. For a quick check on whether this works, merely connect switched 12 volts from the fuse box to the A terminal on the connector. The A terminal is the one that needs switched 12 volts while the B terminal will need to be grounded. We ran down a Dorman part that will do the trick. If the male plug for the connector is missing, you’ll need to find one. If there is no electrical connection to the transmission, that is a huge indicator that the system won’t work in its current configuration. All that’s needed to test this first is to apply 12 volts to the A terminal on the four-pin connector on the side of the transmission. The kits add a pressure switch inside the transmission that enables the torque converter clutch to engage when the transmission shifts into fourth. The contents of these kits vary, but before you purchase one, it’s possible the transmission may already have the conversion accomplished and all it needs is a simple 12-volt connection. Several companies, including Painless and TCI, offer kits. Jeff Smith: The most popular way to convert a 2004R or 700R4 to lockup is to do so when the transmission shifts into 4th / overdrive. So how do I get the converter to lock up in fourth gear? - T.D. I have a buddy with a 700R4 with a lockup converter and his rpm drops a lot more than mine does when it shifts into fourth gear. But driving it now for a while, I don’t think the converter is really locking up. The guy who I bought it from said the trans has a lockup converter and that everything worked great. I recently purchased a’71 Camaro with a small-block and a 700R4 overdrive trans. When the brake pedal is depressed, the switch opens and power to the torque converter clutch is removed and disconnects from the input shaft. The lower connections are normally closed, which would route power to the 700R4. Tire Size, RPM, Speed, and Differential Ratio Calculator () Probably the easiest one with a guy with a 1 to 1 output on the trans to put in three factors and get the fourth.This is the four pole brake-light switch mentioned below.

This is actually an electric vehicle speed rpm tire size calculator but outside of having to figure in the trans overdrive ratio to get either the engine rpm or rear end ratio right it is seriously simple to use.

Playing with the numbers shows that at 65 in second gear = 1.63 you would be doing 4106 rpm. Looking at this calculator with the 3.23 gear and if you have a 28 inch tall tire you should be showing 1900 rpm at 70 Calculate RPM for Given Speed(MPH), Rear Gear Ratio, and Trans Gear Ratio ()

The reverse gear in this transmission is 2.9. Looking up the gear ratios of the trans shows The gearing that was used was 3.06 for first gear, 1.63 for second, 1 for third gear, and 0.7 for fourth gear, essentially a 30% overdrive. 700R4 usually works best with around a 3.7 gear. The 3.23 gears might be part of the issue.